When I was 18(many years ago) and my boyfriend at the time started to go down on me. It was the first time I had oral. I was extremely nervous. I started laughing histerically, and as he gets right past my belly button a huge fart errupts from my ass because I was laughing so hard. I was sooo embarrassed. He comes flying up to the top of the sheets for fresh air. I felt so awful about it, but it was an accident. It took several minutes to convince him to go down again. He was really a good sport about it. It has never happened again. Thank goodness!